This 25 piece jobber drill bit set has a quality TiN coating which helps the bit last longer. The design includes a unique multi-layer coating, split point and modified web construction. These aspects allow you a wider range of applications, reduced thrust requirements and increase rigidity. Made to DIN 338, these drills are high quality HSS, they can be used on a wide range materials including cast steel alloyed and non-alloyed, grey cast iron, graphite, malleable cast iron and woods. Sizes from 1-13mm in 0.5mm increments.